Question

a is 1 and d is half find the sum of 16 terms​

Answer 1

Answer:

And, First four terms of this A.P. will be 4, 1, – 2 and – 5. ... If they form an A.P. find the common difference d and write three more terms. ... a4 – a3 = 16 – 8 = 8.

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Answer 2

Answer:

a=1 d=1/2

S16 =n/2×[2a +(n-1)×d]

putting the value in formula we get

= 16/2 [2×1+15×1/2

=8×[3+15/2]

=8×10.5

=31.5

Step-by-step explanation:

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