This question was previously asked in

MPPEB Stenographer 15 Sept 2018 Shift 1 Official Paper

- 10
- 70
- 11
- 7

Option 3 : 11

**Concept: **

a^{n} + a^{n} = 2 a^{n}

an × an = a^{2n}

**Calculation: **

710 + 710 + 710 + 710 + 710 + 710 + 710 = 7n

7 × 710 = 7n

711 = 7n

**∴ The required value of n is 11.**

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