Question

75 se 97 to ki sabhi prakrtik sankhyo ka yog

Answer 1

Step-by-step explanation:

S=n(2a+(n-1)d)/2

=22(2*75+(22-1)1)/2

=22(150+21)/2

=3762/2

=1881

Answer 2

Step-by-step explanation:

75+76+..........97

first term a=75

common difference=76-75=1

last term 'l'=97

we know from AP that l=a+(n-1)d

97=75+(n-1)1

97=75+n-1

solving we get n=23

so sum=n/2(a+l)

=23/2(75+97)

=23/2*172

=1978