Question

if a is the first term and l is the last term of an arithmetic progression then sum of its first n term is given by
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Answer 1

Answer:

ggdfhkkmxcmlhjioogy88

Answer 2

Answer:

n(a+l)/2

Step-by-step explanation:

a=1 l=10 then n=10

then sum of 1 to 10 terms

= 10(1+10)/2

=10×11/2

=5×11

=55