We know that, 71=7,72‌=49,73=343,74=2401 75‌=16807 For λ=1,µ=3,7,11,...,97 ∴ Favourable cases =25 For λ=2,µ=4,8,12,...,100 ∴ Favourable cases =25 Similarly for every λ, favourable µ=25 ∴ Total favourable cases =100×25 ∴ Required probability =‌