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start putting the values of n in first and second part respectively
I am explaining the first part now
start putting the values of N starting from n equal to 1 then put value and equal to 2 hands on then you can find the difference by subtracting the first number by second
then you will find that the given sequence is in AP
then put the value of n equal to 15 and find the sum by applying this formula
sn=n/2{2a+(n-1)d}
I am explaining the first part now
start putting the values of N starting from n equal to 1 then put value and equal to 2 hands on then you can find the difference by subtracting the first number by second
then you will find that the given sequence is in AP
then put the value of n equal to 15 and find the sum by applying this formula
sn=n/2{2a+(n-1)d}
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