Madhya Pradesh Police Exam Model Paper 1

GIVEN:
First odd number is 1, second is 3, third is 5 and fourth is 7
FORMULA USED:
${\mathit{a}}_{\mathit{n}}=\mathit{a}+\left(\mathit{n}-1\right)\times \mathit{d}$
${\mathit{S}}_{\mathit{n}}=\mathit{n}/2\left[2\mathit{a}+\left(\mathit{n}-1\right)\times \mathit{d}\right]$ 1Where n = number of terms, a = first term $,{\mathit{a}}_{\mathit{n}}={\mathit{n}}^{\mathit{t}\mathit{h}}$ term, d = common difference, and ${\mathit{S}}_{\mathit{n}}$ = sum of arithmetic progression
CALCULATION: