The nth term of an A.P. is 6n + 4. The sum of its first two terms is :
16
20
26
none of these
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Given,
nth term = 6n + 4
First term = 6(1) + 4 = 10
Second term = 6(2) + 4 = 12 + 4 = 16.
Sum of first two terms = 10 + 16 = 26.
Hence, Option 3 is the correct option.
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The sum of A.P. 4, 7, 10, 13, …….. upto 20 terms is :
650
10 × 27
510
1300
The sum of 40 terms of the A.P. 7 + 10 + 13 + 16 + ….. is :
5240
2620
1310
2680
How many terms of the A.P. :
24, 21, 18, ……….. must be taken so that their sum is 78 ?
Find the sum of 28 terms of an A.P. whose nth term is 8n - 5.