The sum of first five multiples of 3 is 1. 45 2. 55 3. 65 4. 75

First five multiples of 3 are : 3, 6, 9, 12, 15. The above series is an A.P. with first term = a = 3 and common difference = d = 3. The formula for sum of A.P. is given by, Hence, Option 1 is the correct option.

In an A.P. if a = 1, a_n = 20 and S_n = 399, then n is
19
21
38
42

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In an A.P., if a = -5, l = 21 and S = 200, then n is equal to
50
40
32
25

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The number of two digit numbers which are divisible by 3 is
33
31
30
29

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The number of multiples of 4 that lie between 10 and 250 is
62
60
59
55

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Mathematics

The sum of first five multiples of 3 is
45
55
65
75

AP GP

Related Questions

In an A.P. if a = 1, a_n = 20 and S_n = 399, then n is
19
21
38
42

In an A.P., if a = -5, l = 21 and S = 200, then n is equal to
50
40
32
25

The number of two digit numbers which are divisible by 3 is
33
31
30
29

The number of multiples of 4 that lie between 10 and 250 is
62
60
59
55

Mathematics

The sum of first five multiples of 3 is45556575

AP GP

Related Questions

In an A.P. if a = 1, an = 20 and Sn = 399, then n is19213842

In an A.P., if a = -5, l = 21 and S = 200, then n is equal to50403225

The number of two digit numbers which are divisible by 3 is33313029

The number of multiples of 4 that lie between 10 and 250 is62605955

The sum of first five multiples of 3 is
45
55
65
75

In an A.P. if a = 1, a_n = 20 and S_n = 399, then n is
19
21
38
42

In an A.P., if a = -5, l = 21 and S = 200, then n is equal to
50
40
32
25

The number of two digit numbers which are divisible by 3 is
33
31
30
29

The number of multiples of 4 that lie between 10 and 250 is
62
60
59
55