2. The sum of the third and the seventh terms
of an AP is 6 and their product is 8. Find
the sum of first sixteen terms of the AP.
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Answer:
nth term of a(n)= a + (n-1) d
Step-by-step explanation:
nth term of a(n)= a + (n-1) d
a(3) = a +2d
a(8) = a + 7d
a(3) + a(8) = 2a + 9d = 6
a(3) * a(8) = (a+2d)(a +7d) = 8
now solve these 2 equations
you will get value of a and d
after that s(n) = (a + a(n))/2
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