find the number of terms of the AP -12, -9, -6 ...... , 21. If 1 is added to each term of this AP, then find the sum of all the terms of the AP thus obtained.
vidhi1999:
last term -first term and then divide it by the common difference of the AP and then add 1 to it....you will number of terms and don't confuse to add 1 more to the answer bcoz of 1 is getting added to it to each term
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Answer:
Step-by-step explanation:
To find the number of terms in the AP
-12, -9, -6 ...... , 21
here a=-12
d=3
let us find which term is 21,from the formula
so,there are 12 terms in the AP.
If 1 is added to each term of this AP,
Now new A.P. be -11,-8,...,22
n=12
a=-11
d=3
then find the sum of all the terms of the AP thus obtained
Hope it helps you.
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