Math, asked by roopas68, 11 months ago

if the sum of first K terms of an ap is 3 k square minus K and its common difference is 6 find the first term

Answers

Answered by ritu182275

13

Step-by-step explanation:

we know

sn =n/2[2a +(n-1)d]

put n=k

sn=3k^2-k

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