12, 77, 389, 1559, 4679, ?

2, 7, 24, 77, 238, ….

7 : 77 : : ?

123 xx 123 + 77 xx 77 + 2 xx 123 xx 77 = ?

If 56 xx 11 = 9 , 37 xx 13 = 6 , 42 xx 12 = 3 , then find the value of 87 xx 77 .

The heat of combustion of CH_(4)(g), C_(2)H_(6)(g) and H_(2)(g) are -890.3, -1559,7 and -285.9 kJ mol^(-1) , respectively. Which of these fuels is most efficient?

The heat of combustion of CH_(4)(g), C_(2)H_(6)(g) and H_(2)(g) are 890.3, 1559,7 and 285.9 kJ mol^(-1) , respectively. Which of these fuels is most efficient?

Find the mean of data 130, 90, 25, 77, 250, 100 (A) 25 (B) 77 (C ) 112 (D) 120

7, 77, 77, 777 div 77 equals